Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c908ba27b09d186d10f39f09fdab0088f3fe0387d9d5dc5995db1ca5cdbd6f88' 
  AND token = 'n0FoWZ5onMZGzCgrmm6G0sSelxipFz4LU/fWya7trDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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