SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9651eaa564f96b1050238470de74490d2936aaea9b7c69dc9d4b05e45337c37' 
  AND token = 'K3JCAG0qv7CZKj8y+V5Rmfu/1JYdBP60Ikv/BIBONSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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