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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02350d7ac11033ec59d6a132ed8b8c93a9439e7afe1f60d152c6c4162b9d7af2' 
  AND token = 'r/RiP7SmYB13IRW3FWpgs0ystlDVp4ThHhl1trLvJdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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