SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '175c0b3317b8900d6648a7e7b84afb22acd38f7dc21d1b16a5e1db4e4ea85129' 
  AND token = '/7e0DrSgKLCZmdJQeDs/yo4YYWXGzIGuA0iR1pqT09w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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