Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b70cef2da22d7b051b2c5b03a7d10c3fd7a0aa0cc4306d9a701285e06c4df339' 
  AND token = 'D7/yHoAGCzy4/0uMoQeb8ekB6Z1y4cqbpg3kiNgAlnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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