SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b2e6fe4ef1f07ace6520f19baa300fa9b124ac0304b80d85d8fc8c728705c03' 
  AND token = 'GqRLBLVX9GJ2h3cUD1unBwPBTW6AollNihQFmsiQYi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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