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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36bb34613a021ad7ee5a4f2dd9991c3d914709ef38d58cd8ef4bef3c0516eea9' 
  AND token = 'RCS0h3SVo6M3UZf0MRmeQGh/bV3ZxV/dmf1jIe5ZEpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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