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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5832139e85f779bc26482afe464d68e90bdd3566e5d1f4aa530b08fc4c91864c' 
  AND token = '/FQm6v8kxWL5x4ruymgKIkwEbuw8wKf3zukfCMFTgdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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