SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '843734bb44bb67ac7498ff807e93047c82a8d98679e919467c2c179e2ebd8b8f' 
  AND token = 'XVL6fuAvKzY2kJE1LdPf/7CH6+3yFHGauz5yB62GpBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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