SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84014dd4f02ebfe5d482ab5008763dd98717a65437b7c1f3c4fc5a8d8ee8c9b8' 
  AND token = 'XpNjrH8/5CI+lBUGLuLhoBd8EK+4rq4TxyDOfnJhxzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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