Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2623578c364ecb957e83b75615930d6fb8fe60357fae111fad8a8656e39c74e5' 
  AND token = 'r7vVsmCSRu+9QK9AF13AxhMfqbdrEShKyTQeMZwiWz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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