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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99dad8e6c18dcd7347ab85db9be850a3822faff4e7d2f95f971551d38d246a11' 
  AND token = '2Ec20KNBEnnJIC5vdiAVV0mZHkH5gPMkESUQaUFb6PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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