Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8886f16846d17b3b6b584e38bc8a4cbf0536f6a50fc59e744fe0ac6c9a1f99d9' 
  AND token = 'pb1hLmntY18Bot3a1NzrLgPcNmszqoBkyX/NyuG0PPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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