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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c090a0bb1359130493b560dfe8018cf56554a31d4223f46185aa9f4ba0719990' 
  AND token = 'nUz/TBOklnwQeoXp5OYb2etzQy7G/u6fb8JGBzJsJtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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