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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f91a0ac5d8462f8adf4dd63af54fe73244b701aed7379cc2dc195b6527feaa67' 
  AND token = 'UZkNQV9kQLcQ/5ztYfm8oFh3vec1tggx4+amapTupiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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