SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fbee2b58947c9789115ede20269651e294b6e36edf44c9ef43108e289123026' 
  AND token = 'jQXACzJQhC0gWhxc+i/01a+hj/V+sMKth0i6ZUCeUps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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