Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c12db7387c57b64c33fc2c33a80f79ba6b52a4c2d58eaee010ce9d51fc056405' 
  AND token = '9zFRFcIFDcK9FTIg5PkABgy9CXkmLDNJXvW4iGpSJa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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