SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11a2a0c6e2c4900a22d95fd725a8d31213263fddee05b69e024d5b4c8b97fe1c' 
  AND token = 'JQENHp0CDYNIG0QgzYbiP9VEw6l4lMRvgYaBSOFXq28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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