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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b07eaade8ab9cbb818ae464f8c062ca45d7de3055ec19985d62e569facd1e996' 
  AND token = '1HAk8QDkY7cRDIvD2bI1M3bUA0m6D1laNUQBchzpCNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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