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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f49f7e9d9c7c4a4cac8bf8b41674315d70081e4fbd4dbf0b28fa1367fae855f' 
  AND token = 'dGUgzcweTUFImLN5eOOol2iNzsZ7CG3yqz746995Whc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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