Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cdfd3a7307cd1a2dccecc7c8da360b73a6bff16111fadc0bb0039d1c745d9c8' 
  AND token = 'hXLC+FcdQkT2v/9MR8b0BgwvP8j0IVRImjS8Kz4kUBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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