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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87c9456d081fd9e7c734ac6ab4cdabe91effe59eeae9c5d5812391c5344391db' 
  AND token = 'awVd0Fdu3PeY5b0Ve130tAbRCDBThg343oSzyDEySNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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