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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e37cfd699681cd80da9f4c646e50653732d63d79df67350abdcfb3b54acde1a6' 
  AND token = 'a/07ej7YXImjdw6YdMiMdZ/Eo1hfa8S4FCs66E4KFWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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