SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '975ac108d1abb941b5651fdd48a2d93983d32f9d8c137ee77030f20ebc693273' 
  AND token = 'umJNpcBJtA7VuU5bVlGDU3qn/0GiqYZGXiDzs5AJfG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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