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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4e6ee3ae93c9dded67429743045652d7f0afa2e34d9777b2d0377a4b7681b74' 
  AND token = 'h857AfS5rHdctVcWsaFVjNJbMKThyF8Afl1aOF65QP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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