SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b22d7b0514fda792a244e5b33f038ef66f8c7fb9b8e46b9327e73770911d3189' 
  AND token = 'soFdUVvONHzDQpPwtS73ieOY7sCn8kucZzsfadGC5zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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