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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abe9316a0587cda0e4ca5b2d4d3ca207e903c762c53bfef7e46df8330d4f4f0d' 
  AND token = 's8KhzZaK8bgX94fMQUUKMBCH44Ks52wAr4oFRxv9V48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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