SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c234f69bd4865c72829d2414ce9d373ca2fff1980b5b8844f351f81dfd7e544' 
  AND token = '7oIlHvm4MRFjhC9YxBwToWeHZ/W+kATxGibt31H7k7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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