SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '581041d5fc4c326e19fbc36a0c735e6321e4aa265b2678836e5350d833923dcb' 
  AND token = 'ngozGaWsKCi94q+0+F9K6ymGbqsvD+eWdYHGrRYzMzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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