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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '086fd0909dbc4f4efcd72ea2773a6c5fc926a1e902b8c1f74790cddb0ae5c855' 
  AND token = '7eaPlp4jI1BK+so2TVRDnM5KuFUuXifcqlwMPCuBBfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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