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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b93fa8edd30a730d8e9d433f9121fe5be27f6b2ad6ea23bb26611959c0a6ba0' 
  AND token = 'OU8pvaNenN0cLSvwitkGJxyvjgYD87n+T0l8YO1W28w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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