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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ccf8324ec017ac2290647854ff5bb415de52ee862d66960a57b62d1934ce65c' 
  AND token = 'sDgSS9KxezW9d99FsM+uuH7gD294ImXIgi6hTWmAigI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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