SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f6b75cf12b335d177e99edcd2ba41ae031fc173918555876a6b0827b16b9595' 
  AND token = '1Ys9qkC47MLLsngPKyXDOCQGzfsyffYj2RnYFx9fznQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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