SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ec5a2a994ac44f007791396f914d73410559982021736ddb0adc498bb5ef409' 
  AND token = '4emZjsJO5OHy/zly4QRKhsLoz7m0I7V+pPWLTnx/0Gs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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