SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3e75626b96f102d1693b2d84564bbab4051625bcab31e7db5ee69fec43c93fa' 
  AND token = 'BWnWvHoR3KUvnVr2PsDi4wcOKpQoOL6haYJYgVfOeZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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