SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ad2f11148748fbbb46f253f98342034e32b9a4b9382c6ddd282a092f2ef1624' 
  AND token = 'gKos0UIw6Bf/l0WrLUoxqkPwEK6b+nltLU5u5XovPaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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