Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bd1642c06a43f7a647530f9eefb2d212189cda738da5c701207c9ca16421981' 
  AND token = '+kh8bdpz41IDA+px1RkOva3bC8sg4fnTfndIsLiEM+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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