Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '975bc72ca27a73fe2908d2c2eabff882a8c23a3dbd44f5a9750773e2d7aa527e' 
  AND token = 'UjZdB/LOJGiodINuYQoUejIydNzg1tsDyhw+vst6auE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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