SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4badf93d7658b582e2b3db736651e1f33f2791cb57e6da2edabe79de01d69db2' 
  AND token = 'entlVwJ4iuTJcmH+1GRr5ghs7miYaaN7ijfvvYqB4Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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