SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec1bdc6297147f2ef9b2dd9a0b4ad8b4535cb7d749c08420430c7928089f67c3' 
  AND token = '8NrmtyQ/+LTItuSseJCgLS7IezzVO/6z7Pq+DehwUfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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