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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5d24dd9f8beec36f59e9114bb2b833794dca7765f575b2bca51901d31115ab8' 
  AND token = 'IbZYDR7G3RSgE1JGVu3wSfDoe3m9EP79szwSf9mp0aQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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