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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ed899f61f7edf09f554a18cde2c16c295e0ab863dbb8406ad1a6779aaa97c04' 
  AND token = '5/HRWSn5lKR1wcPQ1oWz23iobVegNhT6dkdnVs4Ah/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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