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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad47d07e0ac6df1554ec254c47998d30df762b1d40153276326051256b58838f' 
  AND token = 'I41H7UKMaud30JJHDeDxXxh1UY8xhXVD1hmfCeN7uZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}