Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c786f9525ee1626c1ebaf1ac518e8d5c582e13b725c8dea5d1a9c2a1b3bd8968' 
  AND token = 'WTjBODggYZnvWA3vsiVGtDZsaawUaNd1XHvUls3FcHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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