SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e88add21e416f1a30580c0977a81b2bb8592a06f4f68c888b9e90e397a7c1bf5' 
  AND token = 'bjB7CRX4CKNfggki29VZS1BQ6LqZQdOQAoX4/uq6Kw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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