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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb3b0b2c9c16da90285129af6003065061737ae9d6abd0db50249a1a87136af7' 
  AND token = 'rToRVEZBQAys3PVg4Y9fEI/IRg7/ImcBZvTN+09TRTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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