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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c84cf139ffe78d5d6bcb314644c876be76c7a43c778d80a93c671eb4b1e3730' 
  AND token = '+G4lM+q2x18h7pwKQsXOih/obmkGEeSRk1X24CUoacg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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