SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72892c25518e121fa797a2ec11da8715fb5567e979b52f36b351c37d70f32c83' 
  AND token = 'EL0KMW/WBow8VCU6HqZ8MA7fOvcL0FIJZ444IU4HYwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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