SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0bf327ba1c5c49a95964ce3026950831ead80e78064492da912f4b57cd58ea44' 
  AND token = '+fXjZKANaCBRVOmWK0NrFUHTkTYM0XJ2bt7FKU+GIu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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