SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12dab691c571c0304e4e190d672582770dc4c316360d7fb9815039b2840b4b6d' 
  AND token = 'cLgn+Izv+vk35FZdq+xMDg3JwPMaq9JAR8FOVPoGyxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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