SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ff6b3a66fc61e1cd24c07c6217785a81fe6ff9e745a459bb23444c4b4ac5fd1' 
  AND token = '/I/uoljPg5qK6CPsinVK7t92v8KVXixZ9/RbXU8kpBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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