SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77a820f33af599c7421fd0eb079ec48256d2b97834e82eefb26633fb3e5543ca' 
  AND token = 'BIKNIUZqaxowWvO3nRgoh0LYB8DRHudoaKefHhVS2/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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