SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac42cfa1883f063eb0b2a85684b6ed85db7f40a9c17753176c7288725c89b5ed' 
  AND token = 'BWd8JCqGnBI6EK3BuKWrUW0QUjJ/uplfUzR5sdqFmhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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