SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '308b09a0086e4fa9988d3267e2f80cd0c39318c12bca729b3c417f9074165055' 
  AND token = 'Xen89R59z5v4pKufAFiEPLav/zDHVZEMKUb0Fwgx+ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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