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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3ae9efd68af4655f84743da807f72cd736a65cfbfc5da90ec226c18a774726b2' 
  AND token = 'PFUW7PxZiOIntAjTFpX3G0A0La9OEloAtbKA8dxILhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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