Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '578b0c91c71b851aa39739d3462967a420878ee8c3381f712e405670bebdbc9d' 
  AND token = '20CVEHlJ07q2mgIjQE17AVOet4MrIcW8xW8IgNqmuTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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