SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ab37b7c1ef72407a1a22fc2f52b711393df1911609b82731fda4e34dd1fb677' 
  AND token = 'ezDY86+lChL5gTwpzuLZc8Rs7Gr5wOxgeB3+BaXnb60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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