SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2ef5d2c714045f3459132df65977b405990451d667c88478cd9eeed242349cf' 
  AND token = 'JOaKM9wHsTKQThesdIxjDGoZSqmux4LeRyXuzo4+yJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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