SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5417aa5230f9f996b876c281296702106ef3b9f7d652bb8bb0d4bdc4b067995' 
  AND token = 'klhAUIqkOfLTvCggSJ5ejInpi1IxuZdWHCEK4URluaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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