SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca6bdafe629fcb7f6266f675019a5a247fa016b71ce1a3d607f693bedf8bd2ae' 
  AND token = 'nJzQdauM1Uq2BWnvjDuaxZuqUFKG4X63/xM3rbuHpsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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