SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '799c2324b72dbc3d6af6603d007d78673446068c60a346e913deb89359a1ba8e' 
  AND token = '1IHXvvv/jas/zqBSG+60DSCAJZMEwC6jMx/9g4v0Ubg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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