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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd15be3a7ed4dd8d014d7b47cfb08e3060cc04fbe31cc6349463bc117a827dedb' 
  AND token = '8S+CzViUr+n9ZDcQQhiJ7j0Ue0W5HRjBWrz+5RY6290=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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