SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '824a5f5b22eb4587f4d7d22035c533b16db32aa994f0011cb677f850a5e830ee' 
  AND token = 'yYdPCd7qBiOujcrGbaQRuImYRiwvHaw+h5PBQzkN51M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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